Speed Control - Diagnostic Procedures: Detection

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As with most sensors, there are certain conditions under which detection issues can occur. The owner/driver's attention should be drawn to the driver's handbook to avoid misunderstandings as to what is, and isn't, a fault.

Detection issues may occur;

When driving on a different line to the vehicle in front
When vehicles edge into your lane
When going into or coming out of a bend
With detecting motorcycles
With detecting stationary objects, such as traffic queues, broken down vehicles, etc.

In circumstances such as these, the ACC system may brake late or unexpectedly, or may increase speed. This is not a fault , but is the system reacting to detection issues.

The owner's handbook makes it clear that the system should only be used under suitable conditions, but technicians should be wary of wasting time on complaints which are not actually faults.